Re: Stripped plastic lenses
- From: William Stacy <wstacy@xxxxxxxxx>
- Date: Mon, 12 Sep 2005 03:41:22 GMT
salmonegg@xxxxxxxxxxxxx wrote:
About 18 months ago, I got plastic bifocals. Recently, I got new GLASS glasses because the AR coating on the old glasses was deteriorating. Apparently, the base material was not really damaged. I just got them back after having the coating stripped off. They seem be nice and clear now. I will keep them as backup glasses.
The consequence of this is that I will not get plastic glasses again. Moreover, until I can get hard AR coatings on the glass, I will do without them.
Now this seems to be a contradiction. Your plastic lenses came through the stripping process just fine, and you "will not get (them) again"! And then you say you will do without the (glass) lenses????
By the way, unless new techniques have been developed, hard coatings cannot be stripped off of glass. Using any acid to remove magnesium fluoride commonly used for such coatings will generate enough hydrofluoric acid to etch the glass substrate.
It's been ages since I ordered AR coated glass lenses, but I do recall them being strippable. I have no idea what chemical or other process they used, but the same lab that coated 'em could strip 'em...
w.stacy, o.d.
.
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